First of all, Transportr gives you access to travel information for many
different public transportation providers all over the world. You do not
have to install and update several apps for all the public transport
providers in different countries and cities.

After you selected them once, you can afterwards switch between them
easily.

You can search for nearby stations. For example which stations are
available around FSFE's Berlin office.

As well as display them with OpenStreetmap data.

You can have a look at all departures from a train stop.

And of course find connections between two locations. For example from
FSFE's Berlin office to Brussels.

When you decided which train you want to take, you can add the
connection to your calendar with a click on the upper right, as well as
regularly update the connection to see if there are any delays.